Corona ring



FIG. 1 is a front elevation view of the corona ring, showing my new invention;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a left side elevation view thereof; and,

FIG. 7 is a perspective view thereof.

The broken line portion of the drawings is included to show portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a corona ring, as shown and described. 